Source/JavaScriptCore/wasm/WasmOMGPlan.cpp

/*
 * Copyright (C) 2017-2020 Apple Inc. All rights reserved.
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#include "config.h"
#include "WasmOMGPlan.h"

#if ENABLE(WEBASSEMBLY)

#include "B3Compilation.h"
#include "LinkBuffer.h"
#include "WasmB3IRGenerator.h"
#include "WasmCallee.h"
#include "WasmNameSection.h"
#include "WasmSignatureInlines.h"
#include <wtf/DataLog.h>
#include <wtf/Locker.h>
#include <wtf/StdLibExtras.h>

namespace JSC { namespace Wasm {

namespace WasmOMGPlanInternal {
static constexpr bool verbose = false;
}

OMGPlan::OMGPlan(Context* context, Ref<Module>&& module, uint32_t functionIndex, MemoryMode mode, CompletionTask&& task)
    : Base(context, makeRef(const_cast<ModuleInformation&>(module->moduleInformation())), WTFMove(task))
    , m_module(WTFMove(module))
    , m_codeBlock(*m_module->codeBlockFor(mode))
    , m_functionIndex(functionIndex)
{
    ASSERT(Options::useOMGJIT());
    setMode(mode);
    ASSERT(m_codeBlock->runnable());
    ASSERT(m_codeBlock.ptr() == m_module->codeBlockFor(m_mode));
    dataLogLnIf(WasmOMGPlanInternal::verbose, "Starting OMG plan for ", functionIndex, " of module: ", RawPointer(&m_module.get()));
}

void OMGPlan::work(CompilationEffort)
{
    ASSERT(m_codeBlock->runnable());
    ASSERT(m_codeBlock.ptr() == m_module->codeBlockFor(mode()));
    const FunctionData& function = m_moduleInformation->functions[m_functionIndex];

    const uint32_t functionIndexSpace = m_functionIndex + m_module->moduleInformation().importFunctionCount();
    ASSERT(functionIndexSpace < m_module->moduleInformation().functionIndexSpaceSize());

    SignatureIndex signatureIndex = m_moduleInformation->internalFunctionSignatureIndices[m_functionIndex];
    const Signature& signature = SignatureInformation::get(signatureIndex);

    Vector<UnlinkedWasmToWasmCall> unlinkedCalls;
    unsigned osrEntryScratchBufferSize;
    CompilationContext context;
    auto parseAndCompileResult = parseAndCompile(context, function, signature, unlinkedCalls, osrEntryScratchBufferSize, m_moduleInformation.get(), m_mode, CompilationMode::OMGMode, m_functionIndex, UINT32_MAX);

    if (UNLIKELY(!parseAndCompileResult)) {
        fail(holdLock(m_lock), makeString(parseAndCompileResult.error(), "when trying to tier up ", String::number(m_functionIndex)));
        return;
    }

    Entrypoint omgEntrypoint;
    LinkBuffer linkBuffer(*context.wasmEntrypointJIT, nullptr, JITCompilationCanFail);
    if (UNLIKELY(linkBuffer.didFailToAllocate())) {
        Base::fail(holdLock(m_lock), makeString("Out of executable memory while tiering up function at index ", String::number(m_functionIndex)));
        return;
    }

    omgEntrypoint.compilation = makeUnique<B3::Compilation>(
        FINALIZE_WASM_CODE_FOR_MODE(CompilationMode::OMGMode, linkBuffer, B3CompilationPtrTag, "WebAssembly OMG function[%i] %s name %s", m_functionIndex, signature.toString().ascii().data(), makeString(IndexOrName(functionIndexSpace, m_moduleInformation->nameSection->get(functionIndexSpace))).ascii().data()),
        WTFMove(context.wasmEntrypointByproducts));

    omgEntrypoint.calleeSaveRegisters = WTFMove(parseAndCompileResult.value()->entrypoint.calleeSaveRegisters);

    MacroAssemblerCodePtr<WasmEntryPtrTag> entrypoint;
    {
        ASSERT(m_codeBlock.ptr() == m_module->codeBlockFor(mode()));
        Ref<OMGCallee> callee = OMGCallee::create(WTFMove(omgEntrypoint), functionIndexSpace, m_moduleInformation->nameSection->get(functionIndexSpace), WTFMove(unlinkedCalls));
        MacroAssembler::repatchPointer(parseAndCompileResult.value()->calleeMoveLocation, CalleeBits::boxWasm(callee.ptr()));
        ASSERT(!m_codeBlock->m_omgCallees[m_functionIndex]);
        entrypoint = callee->entrypoint();

        // We want to make sure we publish our callee at the same time as we link our callsites. This enables us to ensure we
        // always call the fastest code. Any function linked after us will see our new code and the new callsites, which they
        // will update. It's also ok if they publish their code before we reset the instruction caches because after we release
        // the lock our code is ready to be published too.
        LockHolder holder(m_codeBlock->m_lock);

        m_codeBlock->m_omgCallees[m_functionIndex] = callee.copyRef();

        for (auto& call : callee->wasmToWasmCallsites()) {
            MacroAssemblerCodePtr<WasmEntryPtrTag> entrypoint;
            if (call.functionIndexSpace < m_module->moduleInformation().importFunctionCount())
                entrypoint = m_codeBlock->m_wasmToWasmExitStubs[call.functionIndexSpace].code();
            else
                entrypoint = m_codeBlock->wasmEntrypointCalleeFromFunctionIndexSpace(call.functionIndexSpace).entrypoint().retagged<WasmEntryPtrTag>();

            MacroAssembler::repatchNearCall(call.callLocation, CodeLocationLabel<WasmEntryPtrTag>(entrypoint));
        }

        Plan::updateCallSitesToCallUs(m_codeBlock, CodeLocationLabel<WasmEntryPtrTag>(entrypoint), m_functionIndex, functionIndexSpace);

        {
            if (BBQCallee* bbqCallee = m_codeBlock->m_bbqCallees[m_functionIndex].get()) {
                auto locker = holdLock(bbqCallee->tierUpCount()->getLock());
                bbqCallee->setReplacement(callee.copyRef());
                bbqCallee->tierUpCount()->m_compilationStatusForOMG = TierUpCount::CompilationStatus::Compiled;
            }
            if (m_codeBlock->m_llintCallees) {
                LLIntCallee& llintCallee = m_codeBlock->m_llintCallees->at(m_functionIndex).get();
                auto locker = holdLock(llintCallee.tierUpCounter().m_lock);
                llintCallee.setReplacement(callee.copyRef());
                llintCallee.tierUpCounter().m_compilationStatus = LLIntTierUpCounter::CompilationStatus::Compiled;
            }
        }
    }

    dataLogLnIf(WasmOMGPlanInternal::verbose, "Finished OMG ", m_functionIndex);
    complete(holdLock(m_lock));
}

} } // namespace JSC::Wasm

#endif // ENABLE(WEBASSEMBLY)